<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Layout Demo</title> <!-- 补充具体页面标题，可根据实际功能修改 -->
    <style>
        * {
            margin: 0;
            padding: 0;
            overflow: hidden;
            box-sizing: border-box;
        }

        .page-container {
            margin: 0 auto;
            width: 800px;
            height: 600px;
            background-color: rgb(204, 210, 247);
        }

        .header {
            width: 760px;
            height: 120px;
            margin: 20px;
            background-color: rgb(144, 192, 141);
            display: flex;
            justify-content: space-between;
        }

        .header-left {
            height: 120px;
            width: 480px;
            display: flex;
        }


        .header-block {
            margin: 20px;
            width: 80px;
            height: 80px;
            background-color: rgb(204, 210, 247);
        }


        .main-content {
            width: 760px;
            height: 420px;
            margin: 20px;
            background-color: rgb(144, 192, 141);
            display: flex;
        }


        .sidebar {
            height: 420px;
            width: 240px;
            display: flex;
            flex-direction: column;
        }


        .sidebar-top {
            height: 300px;
            width: 200px;
            background-color: rgb(204, 210, 247);
            margin: 20px;
        }


        .sidebar-bottom {
            height: 90px;
            width: 200px;
            display: flex;
            justify-content: center;
            margin: 0px 20px 0px;
            column-gap: 25px;
        }


        .sidebar-bottom-block {
            width: 50px;
            height: 50px;
            background-color: rgb(204, 210, 247);
        }


        .right-list {
            width: 520px;
            height: 380px;
            display: flex;
            flex-direction: column;
            margin: 20px;
        }


        .right-list-item {
            width: 480px;
            height: 40px;
            margin-bottom: 15px;
            background-color: rgb(204, 210, 247);
        }
    </style>
</head>

<body>
    <div class="page-container">

        <div class="header">
            <div class="header-left">
                <div class="header-block"></div>
                <div class="header-block"></div>
                <div class="header-block"></div>
                <div class="header-block"></div>
            </div>
            <div class="header-right">
                <div class="header-block"></div>
            </div>
        </div>


        <div class="main-content">

            <div class="sidebar">
                <div class="sidebar-top"></div>
                <div class="sidebar-bottom">
                    <div class="sidebar-bottom-block"></div>
                    <div class="sidebar-bottom-block"></div>
                    <div class="sidebar-bottom-block"></div>
                </div>
            </div>


            <div class="right-list">
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
                <div class="right-list-item"></div>
            </div>
        </div>
    </div>
</body>

</html>